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# What is asin() in Dart?

harris910

The asin() function, also called the arc sine function, returns the inverse sine of a number. To be more specific, it returns the inverse sine of a number in radians.

Figure 1 shows the mathematical representation of the asin() function.

Figure 1: Mathematical representation of inverse sine function

Note: dart:math is required for this function.

To convert radians to degrees, use the following formula:

degrees = radians * ( 180.0 / pi )


### Syntax

double asin(double num)


### Parameter

This function requires a number as a parameter. The parameter must be a double value between -1 and 1.

• -1 \leq parameter \leq 1.

• If the value is outside -1 \leq parameter \leq 1, then it returns NaN.

### Return value

asin() returns the inverse sine of a number in radians that is sent as a parameter. The return value lies in the interval [-\pi/2, \pi/2] radians.

### Code

import 'dart:convert';
import 'dart:math';
void main() {
print("The value of asin(0.5): ${asin(0.5)} Radians"); // negative number in radians print("The value of asin(-0.5):${asin(-0.5)} Radians");

//applying asin() and then converting the result in radians to degrees
// PI = 3.14159265
double result=asin(0.5) * (180.0 / pi);
print("The value of asin(0.5): ${result} Degrees"); //error output print("The value of asin(1.5):${asin(1.5)} ");
print("The value of asin(-1.5): \${asin(-1.5)} ");
}

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